Some researchers disagree with the notion that the labels "easy," "difficult," and "slow-to-warm-up" are the best way to conceptualize temperament. these psychologists argue that are the core dimensions of temperament.

I believe the answer is: self-regulation, inhibition, and negative affectivity

Self regulation refers to the ability to control our emotions and action so we can act appropriately. Inhibition refers to a voluntary restriction that we made to oppose our instinct, and negative affectivity refers to the ability to suppress negative emotion